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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8396a9e2e6953630f60382ebac92a7455cffff84d33fcd32e9aff4882e2512ec' 
  AND token = 'Qm+QiWkX37uq8g9zlBVGxQ9rnzzelizs17fYKglXMB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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