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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae121f0499c02c8b4c34b748e44cd5034c168d17491ffee8e3c552127a7a7140' 
  AND token = 'AkBeR2eXzackfue0sYug8OPgoI1G29oeNWLOzK57WQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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