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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26241198702a76ef5e46482c54724269c57e0231d03a87efda685ce4a9f32d3' 
  AND token = '+bQ9baFyCzF0+caA05TaEMd58Ej61S01RdwtA7Iqkgo=' 
  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"
    }
  }
}