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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd661ee0d6a868b9f09680304a5151dbc5630f6d95e177ba27e11eca7fe571fd2' 
  AND token = 'meYqZL3EGv+So7oizMsoSek/nZP9w/FSJ0gawQYidNg=' 
  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"
    }
  }
}