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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f636c2039b5b60146a814b09c417f2134a460045433a38c8ad8fe40b24d4895b' 
  AND token = '49nTcgOzafhCtCPGN1vDnJt6UoKnYOL7r5Ah1YlWqr0=' 
  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"
    }
  }
}