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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83796c74829a33b52a2d12b29d0f848b0c5254c941c17f9eb9176618db794155' 
  AND token = 'ZZa6qe3OaiT0IPQB+pnMg0Lx7xUO/Zzco1OD2FRndzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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