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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facaec9d510602d8d9810fa113eee3437bf23acc61cc39b0674723d3fd5b27ac' 
  AND token = 'n3OE9X+zFLVWVlsNxC0eJKS0Q1w1b5Z43+6QmlZCfEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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