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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98f2adbab2bf43a17a05e78f915fdd8459adb4ec95b3ae7b0d073128fa12041' 
  AND token = 'JoLxFMZY1jE3Cy4zDvfu44SgaP2pEBorJV/+LNL5RlM=' 
  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"
    }
  }
}