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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e56e2d48b05cd86b9f2c9add04b7c6893898a5772786d74eb80d6a528ba7c46' 
  AND token = 'BeAxojcAUOAi4w0+zqJoWw9YQ28j0M+ApgOMNJS53d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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