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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f4a0b8076b600db5af0689a79a2605529351fbc4c74bb257f6d1a006aca113' 
  AND token = 'YkTAGEzLqm7eXvZF6X4a9XnEy5OWWeFRmJRtmcI64rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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