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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aab1a51ab2c731a3ca14004d9a39a8c6e860585e0603a4535ffb40460248eaa' 
  AND token = 'UwuYHzXsu9JWCdHh4gNIkQdYbOwIeFr4QD4MixA1cVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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