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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a8141d76eaebeda4ea57e21f184471b69cdfd6b431d5b52dbe5dc26b910c42' 
  AND token = 'dLohHizqyg2o1lQph9sR9rezv3s1Co10n4zKb0n9C4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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