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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74410c41e149934886c8c4245f922f7c3a0ac9cfeae7157a262f3924d98abeb5' 
  AND token = 'X8N0wIdMR23W43OIX/vfLOVLiAb+SqE3OcVpeXHOd58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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