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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b72ae0dd4e72991d54363b94e5fe184ed8d4a2198faed8527b0a181c036183' 
  AND token = 'WKypEgYqKnKBgDytHYhFDtHD6Biqhz9Mx4N6Kr9q00o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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