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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c00e669f561ce631121f912d33b0972260f0af13c7eaefe9d1e1bd48a0560a' 
  AND token = 'KfuEo+37N6Zo6r1BUFhpdNlHniyXtsNxO7JAJGW/1xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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