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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84da24a459a0abf84f7fc7fd7bc2ab0ca98304f5abe0411b77b8c930edf34ea7' 
  AND token = 's8YdqS2Nn5qwuf+eJIXpCSaeJ1xs/PddGo7EeQZWGeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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