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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5611abae6c5e5c0ccb3b1bcbb73d6b6eb7f1c5b55491afe5a41a39da64c6664' 
  AND token = 'JWJnGO8JtuezrQGQCJOoO2bfrX+zArYLpZNi5XuoOqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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