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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf367a06c408ca0a2676641b3daf7bece474f37185dd2fa9127aed64fc73ea6' 
  AND token = 'o6lS5nCZZ+o8mktH3nua6+9WSLhSri+2cMflEIkL80U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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