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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b23ce0ab2ae5c00dddebca57957fc7bce5f7a6f6f7f526ac8caf9d70b676bf7' 
  AND token = '/n/XR6MIkE3SM5WYpMvHpc8WdDQiqFr1ymRfJ6MuEt4=' 
  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"
    }
  }
}