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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a0f85521b4f99d4e6cc57395e2aa3f94e2076f9cc34a0e4bf59aaa97d3b3a8' 
  AND token = '67wC3PiJD3d3hjk/ZusByFPyxM+36BPk30vX7g7pV+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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