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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbc9f77c7f7d6d0c6971a34da7d445b2e569aece8e6075266b76ed0860b412d' 
  AND token = 'j8BICQU1ZE66Uut1YjLoJTVX3ZEpdAk26PCTuMG9/l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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