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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d03550c223905c2011d0e8e806b202988afc68ada2f87f43d4a04e17e4dd2e1' 
  AND token = '5I/kY9BoJ4b9imju4tIoGTsYIh47DnJndvGfhFLYN7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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