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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50eed24c412e6984847ad0ac37ee45558de3b5ba817f67cdbe6678caaaa2c66' 
  AND token = '1i4yma0P+1lCn3aAJpOo+e1V4AG/YNKZ6l2ZME3ljjc=' 
  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"
    }
  }
}