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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d51572c50048573c32e796604d2b81fb997687125658de75856aca56b87982' 
  AND token = 'QIFjQl2eX+t4NVFdEnnlh+tbWIsAliMLRQ1YUilRHlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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