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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc530e7dbfde55b5060c82310345d17a959c39f9cc635c10a6b42ab2a6d9e29e' 
  AND token = '3jAaHAs/0OstFjOkGpRW0q4uQHI+TnyRL8uToA2jTro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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