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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3042fc66a8f62586b8cb5b93202aca241222efb9c2631d8cd9d3fd302123abb8' 
  AND token = '7Fjsz7jFil2+/i5SIf7hr2ozWRLyWZdO+oKU37OT4EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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