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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00ef6bc7cb90920fa375c36da4a0886674c224b991c0a49c9a58cb2789d5b7f' 
  AND token = 'bs9u5Gts711dN3GLlgFpbiEf0lC7sxptUiHzSMOF5Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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