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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3da967022a71b319043ad884cf43be7d1cc65d9fa60ac3274818316ee5c54ef' 
  AND token = 'YZEYAioU/vgRtXxo+iaciYr7VKq2sve4qJsO4DJURrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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