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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8b4d6b833e5a4d722072024853d67ef0ffa79197637f824ed6227ea9f09d2a' 
  AND token = '2cb5cFml2/IbhKkJCiGMqNhpasn1ffTx1sU5Sb7InoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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