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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e437374a2a6357c6b9d8784da6c89d694d7102a50622605525b1838ade7017' 
  AND token = 'u12a/nJalC7j1L9n6rVquXwN0LU5CRVnpOgcOF29f6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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