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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831b4fa3bd3e70bd8029c43ba64d98c8d811c8a2100541899d79e218662076c0' 
  AND token = 'qLpJ00KE5UEGC5w8N8xz9Sy2Peb0hazCXHTenfBus3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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