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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c90bd0c03923bdc826e12dc38070e9c3197d50f7d3a5125648a13fe7ba1123a' 
  AND token = 'P3jwuOYZWEITTIvBb/FmVyUZoEsERXjRv/oRTF9sYJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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