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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c021943f37a48e823718789b0ca2605789504a31df633b693d9d8ac21bcdd99d' 
  AND token = '4ebqQ0d50b9YI3cMbNRGllIiwZwyneityq2bhIu2HXE=' 
  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"
    }
  }
}