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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '97ed98488b1260347d3473f7fe5587f7bf996f0ff5a7987c1259f542066acd6e' 
  AND token = 'pef962Qa5k+QS39p634iHuSCTjdmA3N9iXAD6vee2Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00787

JSON explain

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