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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5282dc84977d1e29e5911e8dec679ad33ea6c3fbb25e700f63f76872488357a1' 
  AND token = 'y2RafbKPueO6V/e2dl9gTR95x1iCBFp2B4b4jxRC6js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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