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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '45dc09949f10ddcf451b7d328f5dcf61d4eb739604f980d88c2d71df8c9105dd' 
  AND token = 'a4pGItRpgmDI3kN6I5kXUHEDQmblmuuzqUUK0bB74rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01044

JSON explain

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