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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513f190f689fae3d78243323b28ef61dc15afa0b5f223929de6399d1845c2b89' 
  AND token = 'K42M3wI4o50bmXu1MKXWxGo6LhGxy3LgSPN1KsyKbG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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