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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0207ae2ed1a4e35ab3b3e13d1e962d7935059520c7244143dc7cf26dee11cd24' 
  AND token = 'hYHd3LaGLk9qANRtL3M3oZwUxIcJfGP3EZt+HJPHzcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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