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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8a2a677d3fd2eabdd8148839d4f3d3952f3cd0f3c25e6335547b9a1271fd4ef7' 
  AND token = 'jesP5u/ouaG6ViDSuSfNCYeDOSNX61bB6g+0nYyfI+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00806

JSON explain

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