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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72603e8e1ae8e8b64283bddc67ab7c801498e02b4d00dbd6a188905cc12b0a79' 
  AND token = 'wC/8hSu7TN+SlQvVNOxHrR/blgWRV0zz34s1sfhJAl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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