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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3400fa0d9a8ec18dac4a0a64c7d03336f7a2cbd8aba491087d512b814b6ad3e3' 
  AND token = 'EUaHKfkswiL1fb1O7vvp+ITX8uwkRSaaKpfiWbOpFww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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