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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da96d7ea9d9d4c7daa5c80d7c57a6d52a81c4e7b52545d69395b67a563d54cf' 
  AND token = 'P20TRFisNi2+M+7CAvmJ9B839jzubt/R9HJVOUY5JQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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