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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf03efc2af7a948c54bf810757e69fe66c8547034090756b30479a197c38e6b2' 
  AND token = 'G7wvSr19Xezjv+OeTa+eehEvF3vVR/t+oOnhc3VqtTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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