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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239b03f41273a2a2d3d53b055144acb653d451d1beea75a2e19148e1e04d6f07' 
  AND token = '+hJB4o0OtqYCGvb9b5E6YCDNgvAnkZ+RXY+mxYLR3yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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