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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f1ef5dfa6790b256d7f2d00d2eba885cb4f365bd74edd784e2a61d8de01d47c3' 
  AND token = 'H0hkgZ5g+gkDmuvaiEp+YYQDwfyrLArDi8gvpkoD6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00832

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}