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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dc27cafc892e04c70f7490c420e21672c3db94c0e8a05d0f68e827f604263e' 
  AND token = 'O9uAAI87ALgf82YumgDu0fI8zuRlqrhOIfS/A1czfHQ=' 
  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"
    }
  }
}