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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f326cadf55bec74837b9afa29f465630b838b892f7d5f58308ac7d511db73886' 
  AND token = '4OzjCz5077fUwOsV9N7HHzeeNC8z//5rMwWKfZ3he4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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