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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f39a7708c75d4b9b42cca4b352095d644e68a32985338fb16ccd85480fc3ce4' 
  AND token = '8Fo7DV3gGlRo4k2aTC96tI1ZvFp9lLaWZ2XyDTU+x7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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