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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961bb90416adebfcc2e8d25720ba1832549a8c6b1a3fd96d704c628bd04174be' 
  AND token = 'oE88/538K3ga0xBGZ9j90PHexonlU11pDxAmtyOgJSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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