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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2ad0c59173c527d5de3eeeb9c7bcc878031ed77cb685f20e258d3f05616dc3' 
  AND token = '05SeptD328DUOlL1oL3rcAgBliInh2+tvvtuMcskQ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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