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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1b0af10e9ba26bbb89b9f3a4c47210df19ec43c11b4a9c0fd6d048eaf631bd' 
  AND token = 'wPxxxGbcHf1GvHmhPOgHtUtI4xe9MwXQ73MBGm/694M=' 
  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"
    }
  }
}