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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2d4cdd210a894047de7bfac21c50084ca3a59819ade4d2ea18f6b3f160b148' 
  AND token = 'k6p3V3ZTe+SzMnhKvdl4pizbNYKmQLTR5bHVzAHmYjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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