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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef056689f14e77cb1b9417f512fe837968437bf38e685e4a482171b637052d52' 
  AND token = 'RVuJjtNuqE/nMwx6e6YokSxu1UKTR3N1NM4xJsN7TvU=' 
  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"
    }
  }
}