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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33da01e4c74c872068972696854b6c4ac345a2ea01bd0a3b7eb773371c807347' 
  AND token = 'FoWIoYH0b7P4dc4nkX4KE8GfpJ6M1F2rjpxXjmiKdig=' 
  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"
    }
  }
}