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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a1ebb6a7b542376f6ba6fc67fd9ae111ec4a28f78f1c7b413e96127b1c11fb' 
  AND token = 'Bj3/8ITEwrRW4hCK4YpdPSNX0xajrUP/gJ2x5RNSTUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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