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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a6597004e6d82b36354db05061c83d18ec8cf62663d0440bced12a888bf893' 
  AND token = 'K4ou5mo0P47pdrDZ/8qJ8M04rocUmexWY0viQcKG2uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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