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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9ea1a6570e941358356a4545cfbe9144d2b611fd09eaace0789e7e39d8dd64' 
  AND token = 'ark4C4R+Jykx5guLnSz3oH6hQz9Pud3pqnHhfTVogNY=' 
  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"
    }
  }
}