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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b99dbfe46d553820c91e99af0d3d909179205f384f5faf535f7341be9fda66f' 
  AND token = 'OgTv1W0Xe91DXlafziDSQZ/dFPf4/m8SIMf8qRmebao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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