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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e51497a4508881e4fbd0da68df4a345d9c9cff377950eea756e58a829b3bb9' 
  AND token = 'N1Rj7jUX8xp2ekp0acv6BQIXg5/XWl950vIPgXPJ6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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