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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2fe62218f5281b4a2fc706be3021ccf98cdc6c1778eac3843253cce55c4683' 
  AND token = 'uBPMLd9+9zV7I37Xs+bJcSwOQdqPcjRmIx5OKH4alz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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