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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d63473950abfd7e64a9a51b25ebd305ac8cbd97f738aeab12b03329ccc52bf9' 
  AND token = 'sVnDs7J8yvqqMCbwgxR+AId3HnQLSAtVlbaRgMfy0bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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