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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e966ae5562ab5b43bbc63998df83bf9c00041247d1443197fcf597f78a6b1147' 
  AND token = 'vwpJKBv+kWbex6+wevVf76tAw23kCPi0r8kQfMg1RBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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