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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3dd9fcf3536ab09f47f5754233efe41db4b4fa0cc49e199f07f582b1e9d1535' 
  AND token = 'pKDuRi6buUouKMnh6k1GuXY7qqXJGF2EGovUWOFpwu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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