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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3864f7213626b60f769c20a546178c8331bfafe500add4f35faade69e3f412e3' 
  AND token = 'JRnq5AQOPrbthCEf7obn6Djb/mCiSC1je7wj3VJbgcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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