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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc2b08f8aab029570df932f277d216d7173eb8b0cc7b236dbd0e0e8b35a1453' 
  AND token = 'QwsvzbHeg0AuAbj1bdu3HFUTJ8/p+S9elkfofH8gbJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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