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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ea0a912904fd8bd3ddec057a6a72fee7e0af575d71d1524dd8ad8d7c7f09af' 
  AND token = 'BN2Q+msiR/lD8UixA3Krgb7DNj2Q+NQ83GT/dfkjlyE=' 
  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"
    }
  }
}