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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fab19e151209997d60e11829f3b0fef3a9b48b7a27e4daa6e74395a13ba9e2' 
  AND token = '1Puw0dytY28IEBhM+pjO5yS2Hi8YxE2KDlvPr2DiJX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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