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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b09d64087d3962128150926ff42b6e9beda4c5bdfa6d7c55fbbe8a91811b3aa' 
  AND token = 'LXx4buYUknXH91/+ZDGHFp0LL/TCf+7R5HE7J2ML9WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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