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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b68564de609f5a5eed84e97c333e3dce02941dd5469919256626fe181bac77' 
  AND token = 'CZ244dYh1tkdbL0OQ4EGDCjhJAys1IXvk7dC6zrHX5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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