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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a66ecb9ed647fba7017d1cf2933a8c258f0b03a845ea5931622a4d1d2cd124' 
  AND token = 'WJHMQk9dAsVs8X5HKD4kofzyHZIGpjHQDnHktGdUknw=' 
  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"
    }
  }
}