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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293976ad0f40c341c2e5fe05daf7f70b9135f7fe207d4911e67741eb6ad52c71' 
  AND token = 'JLzQfu7u6pe5Gj/CCrVGcmOUgNha6rGPg9YuKKFgiaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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