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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f69bf98b8bf016fde5a1a398b64f1bb9d6762463d2ff610f70b61fe6e1f714' 
  AND token = 'C67d0xvEZp3riz9svdCLctHkd2T92l9Pz8By0hMLFF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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