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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5d54b36bd4edf41a5c75c9466d2ebd9018e6cf7b4c5593ff7106569491e158' 
  AND token = '3Cdc5ahD6r2mLac+7Ovcur/KxMbHnHGxwCsv6Ko74XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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