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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca4802d00e2d23a2196da229bb1810839b940ccca6fc7e893f89e1364af29bd' 
  AND token = 't42P5LfB2xrRv4VjrxOql8j73i4CtBqQqOkA+wixnSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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