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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c82315942a6772f75cc87317f57f1bf28780472aeae8a534d0ebc027d33d1f' 
  AND token = 'BIQqVV7U6skHbQZqVOHr5QH4it7On3No4HihuQPZ5CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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